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Units of Chapter 17 Static Electricity; Electric Charge and Its Conservation Electric Charge in the Atom Insulators and Conductors Coulomb’s Law Solving Problems Involving Coulomb’s Law and Vectors The Electric Field

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Units of Chapter 17 Field Lines Electric Fields and Conductors

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17.1 Static Electricity; Electric Charge and Its Conservation Objects can be charged by rubbing

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17.4 Coulomb’s Law Coulomb’s law strictly applies only to point charges. Superposition: for multiple point charges, the forces on each charge from every other charge can be calculated and then added as vectors.

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17.4 Solving Problems Involving Coulomb’s Law and Vectors The net force on a charge is the vector sum of all the forces acting on it.

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17.5 The Electric Field Force on a point charge in an electric field: (17-3) F is the electrostatic force exerted on a positive test charge q and E is the electric field Superposition principle for electric fields:

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17.5 The Electric Field Problem solving in electrostatics: electric forces and electric fields 1. Draw a diagram; show all charges, with signs, and electric fields and forces with directions 2. Calculate forces using Coulomb’s law 3. Add forces vectorially to get result

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17.5 Field Lines The electric field can be represented by field lines. These lines start on a positive charge and end on a negative charge.

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17.5 Field Lines The number of field lines starting (ending) on a positive (negative) charge is proportional to the magnitude of the charge. The electric field is stronger where the field lines are closer together.

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17.5 Field Lines The electric field between two closely spaced, oppositely charged parallel plates is constant.

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17.5 Field Lines Summary of field lines: 1. Field lines indicate the direction of the field; the field is tangent to the line. 2. The magnitude of the field is proportional to the density of the lines. 3. Field lines start on positive charges and end on negative charges; the number is proportional to the magnitude of the charge.